Odealo is a secure trading platform for MMO gamers which supports trading with real life money.

NUMBER 1. PRIMED CHAMBER MOD

Price range: $800 - $1,000

Price in Platinum: approximately 70,000-100,000 Platinum

Primed Chamber Mod is by far the most valuable and expensive item in Warframe. The bonuses it grants can be easily matched by well-rolled Riven Mods, but it's considered a legendary collector's item, to which it owes its' astounding price.

Primed Chamber could have been acquired in a few ways:

1. It was awarded to the Top 100 ranked players during the Information Event in 2013
2. For a short period of time, it could have been obtained via transmutation due to a bug
3. It was handed out to a lucky player during several Devstreams
4. Was a reward during Mirror the Mod contest, Warframe Fan Channels Extra-Life Event, and Tennocon 2017

It is unknown whether Primed Chamber Mods will be still obtainable during future Events, but it can be assumed it will keep its' legendary status

NUMBER 2. ARTAX RIVEN MODS

Price range: $100 - $400

Price in Platinum: approximately 8,000-35,000 Platinum

Artax Riven Mods are considered the most expensive Riven Mods in Warframe. They were removed from the loot tables because of the absurd bonuses it granted to Tachyons, regardless of the stats they carried. They are not only extremely useful in the end-game, but also considered limited collector's Mods.

Artax Riven stats may vary greatly, however, because of how limited the item is, its' price very rarely goes lower than 8,000 Platinum.

NUMBER 3. PHASED ANKYROS SKIN

Price range: $400 - $600

Price in Platinum: approximately 35,000-55,000 Platinum

Phased Ankyros Skin was part of a series of semi-transparent skins during The Steam Winter Sale in 2013. Phased Ankyros Skin is the most expensive skin in Warframe, which can be acquired by trading with other players or through the Steam Community Market. 

NUMBER 4. PHASED TIGRIS SKIN

Price range: $250 - $300

Price in Platinum: approximately 20,000-25,000 Platinum

Phased Tigris Skin was also a part of the Phased Skins series during The Steam Winter Sale in 2013. Phased Tigris Skin is the second most expensive skin in Warframe, which can be acquired by trading with other players or through the Steam Community Market. 

NUMBER 5. RUBEDO PLATER VIPER SKIN

Price range: $100 - $150

Price in Platinum: approximately 8,000-13,000 Platinum

Plated Rubedo Viper Skin is another limited and very expensive skin for Warframe weapons. They were obtainable via crafting on Steam and were of limited quantity. Players were able to craft them during The Steam Summer Sale in 2014, and are currently only obtainable by trading with other players or through the Steam Community Market.

Odealo is one of the most secure Warframe marketplaces. It allows regular players to buy, sell, and trade Platinum, Mods, Frames, and Mods with the use of real cash.